package com.zmj.utils;

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

import java.io.IOException;
import java.io.InputStream;

public class DBUtils {
    private static SqlSessionFactory factory;
    private static ThreadLocal<SqlSession> local = new ThreadLocal<SqlSession>();
    static {
        InputStream is;
        try {
            is = Resources.getResourceAsStream("mybatis-config.xml");
            factory = new SqlSessionFactoryBuilder().build(is);

        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public static <E> E getMapper(Class<E> clazz) {
        if (local.get() == null) {
            SqlSession session = factory.openSession(true);
            local.set(session);
        }
        E e = local.get().getMapper(clazz);
        return e;
    }

    public static void release() {
        SqlSession sqlSession = local.get();
        if (sqlSession != null) {
//			sqlSession.commit();

            sqlSession.close();
            local.remove();
        }
    }
}
